A systematic design procedure for selective pulses in NMR imaging

D. J. Lurie*

*Corresponding author for this work

Research output: Contribution to journalArticle

55 Citations (Scopus)

Abstract

Spectral tailoring of an amplitude-modulated radio-frequency (RF) pulse may be used to modify the slice-profile produced by a selective excitation sequence. Optimisation of the profile by intuitive means is difficult, however, due to the non-linearity of the magnetisation's response. A design procedure is presented which uses computer-simulation to calculate the response to an arbitrary RF envelope, and alters systematically the shape of the envelope in order to optimise the slice-profile. Two forms of modulation function are suggested, both based on a truncated-sinc, and the simulated response to optimised 90° and 180° pulses is shown. The effect on the slice-profile of RF magnetic field inhomogeneity is discussed.

Original languageEnglish
Pages (from-to)235-243
Number of pages9
JournalMagnetic Resonance Imaging
Volume3
Issue number3
DOIs
Publication statusPublished - 1 Jan 1985

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Keywords

  • NMR Imaging
  • Numerical optimisation
  • Selective excitation

ASJC Scopus subject areas

  • Biophysics
  • Biomedical Engineering
  • Radiology Nuclear Medicine and imaging

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